<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>border</title>
    <style>
        .item {
            box-sizing: border-box;
            width: 200px;
            height: 200px;
            /* background-color: antiquewhite; */
            margin: 0 auto;
            border-top: 50px solid pink ;
            border-bottom: 50px solid pink ;
            border-left: 50px solid rgba(239, 255, 192, 0.904) ;
            border-right: 50px solid rgba(239, 255, 192, 0.904) ;
        }
    </style>
</head>
<body>
    <div class="item"></div>
</body>
</html>